EN 14081-4:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzbauwerke - Nach Festigkeit sortiertes tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellung von sortiemaschinenkontrollierte SystemeStructures en bois - Bois de structure de section rectangulaire clasé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machineTimber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-4:2009SIST EN 14081-4:2009en,fr,de01-november-2009SIST EN 14081-4:2009SLOVENSKI
STANDARDSIST EN 14081-4:2005+A4:20091DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14081-4May 2009ICS 79.040; 79.120.10Supersedes EN 14081-4:2005+A4:2008
English VersionTimber structures - Strength graded structural timber withrectangular cross section - Part 4: Machine grading - Gradingmachine settings for machine controlled systemsStructures en bois - Bois de structure de sectionrectangulaire classé selon la résistance - Partie 4:Classement par machine - Réglages pour les systèmes decontrôle par machineHolzbauwerke - Nach Festigkeit sortiertes Bauholz fürtragende Zwecke mit rechteckigem Querschnitt - Teil 4:Maschinelle Sortierung - Einstellungen vonSortiermaschinen für maschinenkontrollierte SystemeThis European Standard was approved by CEN on 7 April 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14081-4:2009: ESIST EN 14081-4:2009

2 Contents Page Foreword . 31Scope . 42Normative references . 43Terms and definitions . 44Symbols . 45Settings for timber strength grading machines . 5Table 1 - Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF . 6Table 2 - Settings for Computermatic and Micromatic machines . 9Table 3 - Settings for Raute Timgrader machines (Model given in TG1/1007/06) . 13Table 4 - Settings for Euro-GreComat 702 (Model given in TG1/0107/08) . 14Table 5 - Settings for GoldenEye 702 (Model given in TG1/1005/08 for GB & IE; TG1/1005/09Rev for DE, AT & CZ) . 15Table 6 - Settings for Euro-GreComat 704 (Model given in TG2/0103/02) . 25Table 7 - Settings for Dynagrade machine (including HC and XHC) . 27Table 8 - Settings for ViSCAN machine (Model given in TG1/1005/03) . 35Table 9 - Settings for EuroGreComat 706 (Model given in TG1/0107/09) . 45Table 10 - Settings for GoldenEye 706 (Model given in TG1/1005/04Rev2) . 46Table 11 - Settings for Timber Grader MTG with connected balance (Model given in TG1/0307/05) . 57Table 12 - Settings for Precigrader machine . 60Table 13 - Settings for Grademaster (Model given in TG1/1007/13Rev) . 64Table 14 - Settings for E-scan machine (Model given in TG1/0508/17Rev). . 65Table 15 - Settings for Triomatic machine (Model given in TG1/0508/14Rev). . 66Bibliography . 69 SIST EN 14081-4:2009

3Foreword This document (EN 14081-4:2009) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by SFS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2009, and conflicting national standards shall be withdrawn at the latest by November 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14081-4:2005+A4:2008. Other parts of this European Standard are EN 14081-1, Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements EN 14081-2, Timber structures - Strength graded structural timber with rectangular cross section - Part 2: Machine Grading; additional requirements for initial type testing EN 14081-3, Timber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine Grading; additional requirements for factory production control According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
4 1 Scope This European Standard gives settings, derived according to the requirements given in EN 14081-2, for various combinations of strength classes or grades, grading machines and species from particular sources of growth. These settings are only applicable to timber from the sources indicated in the tables. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 336, Structural timber – Sizes, permitted deviations EN 14081-1:2005, Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements EN 14081-2:2005, Timber structures - Strength graded structural timber with rectangular cross section - Part 2: Machine Grading; additional requirements for initial type testing 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14081-1:2005, EN 14081-2:2005 and the following apply. 3.1
Speed range maximum and minimum throughput speeds appropriate to the critical speed for the derived settings (see 6.2.2 of EN 14081-2:2005). 4 Symbols a deflection (in mm) b width of timber cross section (in mm)
Et,mean characteristic mean tensile modulus of elasticity parallel to grain (in N/mm2)
E0,mean characteristic mean bending modulus of elasticity parallel to grain (in N/mm2)
Edyn value of dynamic modulus of elasticity (in N/mm2) Emod model value of modulus of elasticity (units as stated) F force (units as stated) ft,k characteristic tensile strength (in N/mm2)
5fm,k characteristic bending strength (in N/mm2)
fmod model value of strength (in N/mm2) I indicating property (units as stated) P pressure (units as stated) t thickness of timber cross section (in mm) vc conveyer speed (in m/sec) ρk characteristic value of density (in kg/m3)
ρmod model value of density (in kg/m3)
subscripts
n for setting being calculated a actual size measured as the average dimension of a batch 5 Settings for timber strength grading machines Tables 1 to 15 give settings for certain grades, timber species and types of grading machine. The accepted grading machines and settings in this European Standard are based on initial type testing (ITT) and initial type calculation (ITC). When additional ITT and ITC documentation from the manufacturers has been evaluated by CEN/TC124/TG1 and the accepted values are given in an ITT report, which is the basis for certification by the Notified Bodies overseeing the producers factory production control (FPC). Those ITT reports may be used as ITT documentation before the information they contain becomes available in an amendment or revision of this European Standard, EN 14081-4. SIST EN 14081-4:2009

Picea abies Picea sitchensis 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 2,68 2,27 Requirements for grading:
- Air temperature between +10°C and +35°C - Relative humidity in the air: <= 85 % - Timber temperature: >= -10 °C - Timber mean moisture content: > 10 % - Maximum feed speed: 150 m/min
The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm).
an = 830,7 tn-1,299
(mm)
Pn = 4,412 Fn / tn0,61
(bar)
()572739,413n1.701nnn+=ttFbF
(kN) C16 1,24 Pine
Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 2,79 1,91 C16 1,34 Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C27 C16 3,03 1,43 C24 C16 2,32 2,09 C16 0,92 a) See Clause 7.3 in EN 14081-1:2005 b) Timber sizes shall be to EN 336 c) Grades prefixed by C are strength classes given in EN 338
ƒmod Comments and adjustments for size Estonia Finland Latvia Norway Russiad) Sweden Poland
Finland Norway Sweden Latvia EE FI LV NO RU SE PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 20,8 Requirements for grading:
- Air temperature between +10°C and +35°C - Relative humidity in the air: <= 85 % - Timber temperature: >= -10 °C - Timber mean moisture content: > 10 % - Maximum feed speed: 150 m/min
The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). Pn = 4,412 Fn / tn0,61
(bar)
Fn
= (5,5I n n bntn3)10-12
(kN)
an = 830,7 tn-1,299
(mm)
I n = 79.0mod24,022,0f4228nnbt C24 20,8 C27 21,8 C30 28,5 C35 C24 46,5 20,0 C40 C30 C18 54,5 30,6 23,8 a) See Clause 7.3 in EN 14081-1:2005 b) Timber sizes shall be to EN 336 c) Grades prefixed by C are strength classes given in EN 338 d) Settings apply only to timber grown west of the Ural mountain range and north of the 550 line of latitude in Russia
Species Permitted timber sizesb) (mm) Gradec) or grade combinationModel value Force F (kN) Comments and adjustments for size Spain ES Scots pine Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C27 C16 2,84 1,71 Requirements for grading: - Air temperature between +10°C and +35°C - Relative humidity in the air: <= 85 % - Timber temperature: >= -10 °C - Timber mean moisture content: > 10 % - Maximum feed speed: 100 m/min The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299
(mm) Pn = 4,412 Fn / tn0,61
(bar) ()572739,413n1.701nnn+=ttFbF Spain ES Corsican pine Pinus nigra 40 ≤ tn ≤ 70 100 ≤ bn≤ 200 C30 C18 Not relevant as all settings shall be calculated using equations in comments column Requirements for grading: - Air temperature between +10°C and 35°C - Relative humidity in the air: < 85 % - Timber temperature: > -10 °C - Timber mean moisture content: > 10 % - Maximum feed speed: 100 m/min The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299
(mm) Pn = 4,412 Fn / tn0,61
(bar) FnC30 = (96,2979 – 0,489321tn)anbntn3 / (1,3189433.109 ) FnC18 = (54,4979 – 0,489321tn)anbnt
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